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Finding the Fourth Proportional to 1,278.88, 1,764.93 and 781.39

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Solution

The fourth proportional to 1,278.88, 1,764.93 and 781.39 is: 1,078.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.88 : 1,764.93 = 781.39 : x
  2. Step 2: Convert to fraction form
    1,278.88/1,764.93 = 781.39/x
  3. Step 3: Cross multiply
    1,278.88x = 1,764.93 × 781.39
  4. Step 4: Simplify right side
    1,278.88x = 1,379,098.65
  5. Step 5: Solve for x
    x = 1,379,098.65/1,278.88
  6. Step 6: Final answer
    x = 1,078.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.